Imprisoned by the man who slaughtered my family, I made a desperate bid for freedom, only to lose my life in an unforeseen accident. Yet when I awoke, I found myself back in the past, at a time when my family still lived. Determined to shield them from their cruel fate, I sought every possible path… Until I crossed paths with a demon. The demon offered to grant my wish, but at a terrible price: "the sacrifice of my dearest memories of happiness."